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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
So ask yourself this question: do you have blue under-eye circles, or brown? Brown circles are often the first of the two causes: genetics. But it can also be because of hyperpigmentation caused by rubbing your eyes a lot or excessive exposure to the sun.